Bently Nevada 330425-02-05 Accelerometer 100 mV/g

Bently Nevada 330425-02-05 Accelerometer Product Introduction

The Bently Nevada 330425-02-05 accelerometer provides accurate vibration measurements for rotating machinery protection. This sensor uses a piezoelectric design to convert mechanical vibration into an electrical signal. Its sensitivity reaches 10.2 mV/m/s² (100 mV/g) with a ±5% tolerance. Additionally, the device measures acceleration up to 490 m/s² (50 g) peak within a 10 Hz to 15 kHz frequency range.

You can install this transducer in harsh environments. The operating temperature spans from -55°C to +121°C, and the case resists 100% condensing humidity. Furthermore, the Bently Nevada 330425-02-05 carries multiple approvals including CSA, ATEX, and IECEx. These certifications make it suitable for hazardous locations.

The mounting thread option "02" means an M8 x 1 integral stud. Agency approval "05" confirms the multiple certifications. Meanwhile, the case is electrically isolated from ground, which prevents ground loops. The 3-pin MIL-C-5015 receptacle ensures a secure connection.

Technical Specifications of the 330425-02-05 Accelerometer

Frequency Response and Linearity
The Bently Nevada 330425-02-05 delivers a frequency response of 10 Hz to 15 kHz (600 to 900,000 cpm) at ±3 dB. For tighter tolerances, expect ±10% from 30 Hz to 10 kHz (1,800 to 600,000 cpm). Amplitude linearity stays within ±1% up to 490 m/s² (50 g) peak.

Noise Floor and Transverse Sensitivity
Broadband noise floor measures only 0.039 m/s² (0.004 g) rms from 10 Hz to 15 kHz. Transverse sensitivity remains less than 5% of axial sensitivity. Consequently, you get clean, reliable data even in complex vibration environments.

Resonant Characteristics
Mounted resonant frequency exceeds 30 kHz. The resonant peak amplitude is 20 dB maximum. This high resonance ensures the sensor avoids mechanical amplification within its normal operating range.

Temperature and Base Strain Effects
Temperature sensitivity typically varies from -11% to +3% over the full operating range. For units with serial numbers preceded by "G" (including all new sensors), base strain sensitivity is 49 mm/s²/mstrain (0.005 g/mstrain). Older sensors without the "G" prefix show 980 mm/s²/mstrain without the mounting base. Therefore, Bently Nevada strongly recommends using the supplied mounting base for older units.

Power and Output Requirements
The Bently Nevada 330425-02-05 requires an input voltage of -24 ± 0.5 Vdc. Bias current is 2 mA nominal. Output bias voltage sits at -8.5 ± 0.5 Vdc. This IEPE-style interface simplifies integration with most vibration monitors.

Mechanical and Environmental Parameters

Physical Dimensions and Weight
Weight without cable is typically 99 g (3.5 oz). Diameter measures 23 mm (0.93 in). Height reaches 59 mm (2.3 in) including the mounting stud. Case material is 316L stainless steel, which resists corrosion. Mounting surface finish should be 32 minch rms for best results.

Environmental Limits
Shock survivability peaks at 49,050 m/s² (5,000 g). Relative humidity tolerance is 100% condensing, non-submerged, because the case is hermetically sealed. Magnetic field susceptibility stays below 2.21 mm/s²/gauss (225 mg/gauss) at 50 gauss, 50-60 Hz. Moreover, the IP rating is equivalent to IP68 for the sensor body only (not the cable).

Mounting Torque and Orientation
Apply a mounting torque of 4.1 N·m (3.0 ft·lb). The sensor works in any orientation. For serial numbers not preceded by "G", always use the supplied mounting base to minimize base strain sensitivity.

Maximum Cable Length
You can extend the cable up to 305 metres (1000 ft) without signal degradation. This flexibility allows remote mounting of monitoring electronics.

Installation Guidelines for the Bently Nevada 330425-02-05

First, prepare the mounting surface to 32 minch rms finish. Clean the M8 threaded hole thoroughly. Next, apply a thin layer of anti-seize compound if required by your environment. Then, screw the integral stud into the prepared hole by hand. Finally, tighten to 4.1 N·m (3.0 ft·lb) using a calibrated torque wrench. Do not overtighten, as this may damage the sensor.

For optimal performance, avoid mounting on thin or flexible surfaces. Additionally, keep the sensor away from extreme magnetic fields exceeding 50 gauss. When routing the cable, use cable ties every 300 mm to prevent whipping. The case is isolated from ground, so you do not need isolation washers.

Important note for older units: If your Bently Nevada 330425-02-05 has a serial number NOT preceded by "G", install it with the supplied Mounting Base (API adapter). This step reduces base strain sensitivity from 980 to 4.9 mm/s²/mstrain.

Packaging List

• Bently Nevada 330425-02-05 accelerometer sensor (1 unit)

• M8 x 1 integral mounting stud (pre-installed)

• Mounting Base (API adapter) – for units where applicable

• Protective plastic dust cap for 3-pin MIL-C-5015 connector

• Installation instruction sheet (1 copy)

Note: Certificates and warranty documents are not included in the package.

Shipping Information

All orders ship via FedEx, UPS, or DHL with tracking numbers provided. Delivery typically takes 3-7 business days depending on destination.

Frequently Asked Questions (FAQ)

1. What is the sensitivity of the Bently Nevada 330425-02-05?
The sensitivity is 10.2 mV/m/s² (100 mV/g) with a tolerance of ±5%. This value remains stable across the 10 Hz to 15 kHz frequency range.

2. Can I use this accelerometer in explosive atmospheres?
Yes. The Bently Nevada 330425-02-05 carries CSA, ATEX, and IECEx approvals (option "05"). Always verify local regulations before installation.

**3. What happens if I exceed the acceleration range?
Exceeding 490 m/s² (50 g) peak may cause signal clipping. However, the sensor survives shocks up to 49,050 m/s² (5,000 g) without damage.

4. How do I identify if my unit needs the mounting base?
Check the serial number. If it is NOT preceded by the letter "G", Bently Nevada recommends using the supplied Mounting Base to reduce base strain sensitivity.

5. What is the maximum cable length without signal loss?
You can run cable up to 305 metres (1000 feet). The signal remains uncompromised at this length due to the low output impedance design.